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Fri Jul 23, 2021 8:39 pm

While perusing through a few photos of members engine bays, I noticed a rebuildable style fuel pump sitting next to an Alternator.

Although my fuel pump is in working condition, and appears to be the original, or at least, a VW pump from that era, if I had to replace, I would much prefer to use a rebuildable Pierburg or similar, than anything currently being produced.

Anyone have any knowledge if this can be done WITHOUT a destructive mod to other engine components?

Sat Jul 24, 2021 5:50 am

The Pierburg "square-top" stock pumps (as bug models up to 1970 came with) work fine with the
AL82 Bosch alternators. It's possible the carb mounting nuts will have to be loosened and the carb
lifted a half-inch or so temporarily while installing/removing the fuel pump.

Sat Jul 24, 2021 7:10 am

kreemoweet wrote: The Pierburg "square-top" stock pumps (as bug models up to 1970 came with) work fine with the
AL82 Bosch alternators. It's possible the carb mounting nuts will have to be loosened and the carb
lifted a half-inch or so temporarily while installing/removing the fuel pump.

Tight. But mine comes right off on my set up.

Sat Jul 24, 2021 10:11 am

Xevin wrote: kreemoweet wrote: The Pierburg "square-top" stock pumps (as bug models up to 1970 came with) work fine with the
AL82 Bosch alternators. It's possible the carb mounting nuts will have to be loosened and the carb
lifted a half-inch or so temporarily while installing/removing the fuel pump.

Tight. But mine comes right off on my set up.

I do believe this is the one I saw.
Is there a PN to differentiate?

Any issues with a Motorola Alternator?

Sat Jul 24, 2021 10:54 am

Buy one from Bill.
https://www.thesamba.com/vw/classifieds/detail.php?id=2433235

Sat Jul 24, 2021 11:54 am

There cannot be much clearance (if any) with the alternator.
Here are three genuine VW fuel pumps which I have, one for a generator equiped engine (non-rebuildable pump), one for an alternator equiped engine (non-rebuildable pump) and a rebuildable fuel pump for a generator equiped engine.
I don't think a non-rebuildable fuel pump would have clearance with an alternator fitted because the top is a lot wider.

Sat Jul 24, 2021 1:24 pm

What about using a round top? I'd have to put them side by side, but I think the round top is shorter.

Sun Jul 25, 2021 5:01 am

No “destructive mods” necessary. Square tops work fine with alternators.

A couple weeks ago my gen shit the bed and I chose to do an alt swap.

Sun Jul 25, 2021 6:56 am

Pump shaft reverts to “generator” length?

Sun Jul 25, 2021 7:00 am

The shaft length is determined by the type of pump. I forgot to put a square top and a round top side by side after work yesterday. Maybe today if I can remember.

Sun Jul 25, 2021 8:15 am

OTTO 1303 wrote: Pump shaft reverts to “generator” length?

The square top Pierburg fuel pump uses the longer 108mm steel pushrod.

The issue with a non-slanted fuel pump and an alternator can be clearance to remove the fuel pump without first lifting/removing alternator or fan shroud. Some folks have used bolts to replace the fuel pump mounting studs.

Sun Jul 25, 2021 10:06 am

Thanks for the info.
I know what to do now.